ACI 318-10 PDF

The Reorganized ACI 14 Code. – Are You Ready? Neal S. Anderson, P.E., S.E.. Staff Consultant. Simpson Gumpertz & Heger, Chicago, Illinois. The American Concrete Institute (ACI) has pub- lished Building Code Requirements for Struc- tural Concrete (ACI ) and Commentary. /R ACI Building Code and Commentary. PREFACE. The code portion of this document covers the design and construction of structural concrete .

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318-08: Building Code Requirements for Structural Concrete and Commentary

Concrete, structural lightweight — A concrete containing lightweight aggregate conforming to Section Shear reinforcement consisting of bars, rods or wires shall not be considered effective in members with a total thickness of less than 10 in.

Joints shall be detailed so as to allow sufficient tolerances for manufacture and erection of the members. Charts cover a wide range of concrete and steel strengths. The Commentary is provided for this purpose. The numerical sum of the positive and negative bending moments in the direction of either side of a rectangular panel shall be assumed as not less than in which F — 1.

If column moments have not been considered in the design of the column or if computations show that there is no eccentricity at one or both ends of the column, the factor in a 2 shall be used. The top surface shall be generally level. In structures in which it is normal practice to take into account creep, elastic deformation, shrinkage, and temperature, the effects of such items shall be considered on the same basis as the effects of dead load.

If the number of tests is small, there may be more than the indicated permissive percentage below the specified strength even though the average strength and the uniformity of the concrete are satisfactory. The flange shall be assumed to act as a cantilever. The fraction fcx shall be taken as 0. The limiting value for vc in Section c shall be: To ensure serviceability, consideration is also given to control of deflec- tion and cracking under service loads.

Each paper is indexed by title, author, and 318–10 subject classifications; about 18, entries. The bending moments may be determined approximately by using an equivalent uniform load per lineal foot of beam for each panel sup- ported as follows: The water content shall be the minimum necessary for proper placement but in no case more than 5y2 gal per sack.

Where the actual computed eccentricities at both ends are less than the specified minimum eccentricity, the strength reduc- tion for length shall correspond to the actual conditions of curva- ture and end restraint.


Proper provisions shall be made for eccentric loads and wind stresses.

Building Code Requirements for Structural Concrete and Commentary

Slabs with paneled ceilings may be considered as flat slabs provided the panel of reduced thickness lies entirely within the area of inter- secting middle strips, and is at least two-thirds the thickness of the re- Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on For plain bars, the minimum amount of lap shall be twice that specified for deformed bars.

Shear reinforcement not less than determined from Equation shall be provided at all sections and shall be spaced not farther apart than three-fourths the depth of the member, nor 24 inches, whichever is the smaller, except when it is shown by tests that the required ultimate Generated for Mohamed Aly Abdel-razik Moustafa University of California, Berkeley on Except as provided in 1, separation of the component elements in the direction normal to the surface shall be prevented by steel ties or other suitable mechanical anchorages.

See Section d. Nominal yield strength — The yield strength specified by appropriate ASTM specification or as indicated by Section f.

For negative moments and shears, w is the total dead load plus live load for use in Table 1. A middle strip one-half panel in width, symmetrical about panel center line. In solid slabs the piping, except for radiant heating and snow melting, shall be placed between the top and bottom reinforcement. Such slab shall be reinforced at right angles to the joists with at least the amount of reinforcement required for flexure, giving due consideration to con- centrations, if any, but in no case shall the reinforcement be less than that required by Section Selection of materials and stresses 4.

Cross grain compression 8. A column strip one-half panel in width, occupying the two quarter- panel areas outside the middle strip. Reinforcement in band-width B 2. The average shear stress shall satisfy the requirements of Chapter 12 or Design of tension reinforcement shall not be based on a yield strength, fy, in excess of 60, psi unless tests are made in com- pliance with Section b. Since this primary objective has been achieved by a combined membership effort.

Where metal column capitals are used, account may be taken of their contributions to stiffness and resistance to bending and shear. For cantilever columns, that is, those fixed at one end and free at the other, the effective length h’ shall be taken as twice the over-all length. All simple methods for computation of deflections are, therefore, necessarily approximate. Therefore, background details or suggestions for carrying out the requirements or intent of the Code portion cannot be included.

Prior to the application of the test load, a load which simu- lates the effect of that portion of the service dead load which is not already present shall be applied and shall remain in place until after a decision has been made regarding the acceptability of the structure. After 7 days moist curing followed by 21 days drying at 73 F and 50 percent relative humidity, eight of the test cylinders at each of the two strength levels shall be tested for splitting strength and four for compressive strength.


The concret- ing shall be carried on at such a rate that the concrete is at all times plastic and flows readily into the spaces between the bars. When, in the opinion of the Building Official, the strengths of the job- cured specimens are excessively below those of the laboratory-cured specimens, the contractor may be required to improve the procedures for protecting and curing the concrete.

In deter- mining the spacing of the reinforcement in the column strip, the mo- ment may be assumed to vary from a maximum at the edge of the middle strip to a minimum at the edge of the panel.

Admixture—A material other than portland cement, aggregate, or water added to concrete to modify its properties. Effective area of 138-10 area of a section which lies between the centroid of the tension reinforcement and the compression face of the flexural member.

The end of a column shall be considered hinged in 31-810 plane if in that plane r’ see Section exceeds At least 25 percent of required negative reinforcement in the column strip shall cross the periphery located at a distance of 38-10 from the column or column capital.

Wci structure may be considered divided into a number of bents, each consisting of a row of columns or supports and strips of supported slabs, each strip bounded laterally by the center line of the panel on either side of the center line of columns or supports.

The work of the Institute is made available to the engineering profession in the ACI Proceedings, published annually sinceand in a variety of separate publications. The minimum number of bars shall be six for spiral columns and four for tied columns.

Bending tightly around the longitudinal reinforcement through at least deg.

Concentration of reinforcement over the column head by additional reinforcement or closer spacing may be used to resist the moment of the section. The shear stress, vc, permitted on an unreinforced web in Sec- tion c shall be 0. Rectangular sections, or flanged sections in which the axi axis lies within the flange: